<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>Document</title>
    <style>
      .pad {
        display: inline-block;

        /* 更改背景色透明度 */
        background-color: rgba(110, 109, 107, 0.6);
        padding-top: 20px;
        padding-bottom: 20px;

        width: 265px;
        height: 525px;
      }
      a {
        display: inline-block;
        margin-top: 16px;
        margin-bottom: 16px;
        margin-left: 30px;

        /* 去下划线 */
        text-decoration: none;
        color: #fff;
      }

      .aa:hover {
        width: 100%;
        background-color: coral;
      }

      .xs {
        display: inline-block;
        height: 525px;
        width: 600px;
        background-color: blueviolet;
        visibility: hidden;
      }
      .father {
        display: flex;
      }
      .pad:hover .xs {
        visibility: visible;
      }
    </style>
  </head>
  <body>
    <div class="father">
      <div class="pad">
        <div class="aa"><a href="#">手机 </a></div>
        <div class="aa">
          <a href="#">电视 </a>
        </div>

        <div class="aa">
          <a href="#">家电 </a>
        </div>
        <div class="aa">
          <a href="#">笔记本 平板 </a>
        </div>
        <div class="aa">
          <a href="#">出行 穿戴 </a>
        </div>
        <div class="aa">
          <a href="#">耳机 音响 </a>
        </div>
        <div class="aa">
          <a href="#">健康 儿童 </a>
        </div>
        <div class="aa">
          <a href="#">生活 箱包 </a>
        </div>
        <div class="aa">
          <a href="#">智能 路由器 </a>
        </div>
        <div class="aa">
          <a href="#">电源 配件 </a>
        </div>
        <div class="xs 1">111111111</div>
        <div class="xs 2">222222222</div>
        <div class="xs 3">333333333</div>
        <div class="xs 4">444444444</div>
        <div class="xs 5">555555555</div>
        <div class="xs 6">666666666</div>
        <div class="xs 7">777777777</div>
        <div class="xs 8">888888888</div>
        <div class="xs 9">999999999</div>
        <div class="xs 10">1010101010</div>
      </div>
    </div>
  </body>
</html>
